[HTML5] Add jsdoc2rst tool.

A template for `jsdoc` that generat the HTML5 public classref.

The script can be run via `npm run docs` to print to stdout.

You can dry run via `npm run docs -- --d dry-run` or write to file via
`npm run docs -- -d /path/to/file.rst`

Also update Makefile in `doc/` and add dry run test to CI.

.github/workflows/static_checks.yml

@@ -35,11 +35,12 @@ jobs:
         run: |
           bash ./misc/scripts/black_format.sh
 
-      - name: JavaScript style checks via ESLint
+      - name: JavaScript style and documentation checks via ESLint and JSDoc
         run: |
           cd platform/javascript
           npm ci
           npm run lint
+          npm run docs -- -d dry-run
 
       - name: Documentation checks
         run: |